[Talk-nz] Turn restrictions rabbithole

[Eliot Blennerhassett]

Now I've seen these restrictions visualizers...

https://ahorn.lima-city.de/tr/?zoom=18&lat=-43.553894&lon=172.635211&layer=Grayscale&overlays=TTT

https://restrictions.morbz.de/#17/-43.55386/172.63474

I'm seeing a huge proliferation of labelling every way of a junction
with what I call a "Self No U-turn" i.e. the from and to members are the
same segment.

See for example this area:

https://ahorn.lima-city.de/tr/?zoom=18&lat=-43.553894&lon=172.635211&layer=Grayscale&overlays=TTT

https://restrictions.morbz.de/#17/-43.55386/172.63474

If you look at
https://wiki.openstreetmap.org/wiki/Relation:restriction#Tags, it says
"*to add a no_u_turn restriction relation seems only useful if
from-member and to-member are different way objects"

So I think all these no-U that I'm seeing are useless, and in some cases
actually erroneous e.g. when the T junction is between a driveway and a
road it is not prohibited to do a U turn on the road.  And they make it
harder to review actual turn restrictions.


I've deleted a bunch, but I'm interested if anyone else has any opinion
on this.


No-U-turn where the From and To members are different ways is of course
still valid e.g.
https://www.openstreetmap.org/relation/9027919
https://www.openstreetmap.org/relation/5391722

--
Eliot